Scissor-Frame Vehicle Seat Height Control With Air Spring Damping
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Solution Overview
Problem
Existing vehicle seats lack individual height adjustment options while providing effective vibration damping, which is crucial for comfort and optimal positioning in commercial vehicles.
Innovation Solution
A vehicle seat design featuring a height-adjustable scissor-action frame with a variable air spring, controlled by a manually actuable control lever and guide element, allowing for precise adjustment of seat height through a transmission element and switching mechanism, independent of the driver's weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a compressed-air spring is arranged on the scissor-action frame for vibration damping, then vibration damping is improved, but individual height adjustment capability deteriorates
Solution Approach 1:
The switching element is designed to be pivotable about a first axis of rotation, allowing its neutral position to be dynamically adjusted. The guide element enables the switching element to change its angular position, thereby adapting the system from a fixed vibration-damping configuration to a dynamically adjustable one that provides both vibration damping and individual height adjustment capabilities.
Solution Approach 2:
The guide element acts as an intermediary between the control lever and the switching element. It translates the control input into opposing relative movements between the switching element and the transmission element, enabling precise control of the air spring's air volume and从而实现 individual height adjustment while maintaining vibration damping.
2Ease of operation
If automatic weight-adjustment is implemented for vehicle seats, then comfort is improved, but individual height adjustment capability deteriorates
Solution Approach 1:
The switching element serves multiple functions: it controls the air volume of the air spring for both automatic weight-adjustment and manual individual height adjustment. By making the neutral position of the switching element adjustable via the guide element, the system becomes universal, capable of performing both automatic comfort adjustment and individual height setting operations.
Solution Approach 2:
The system transitions from a purely automatic weight-adjustment mechanism to a dynamic system where the neutral position of the switching element can be manually adjusted. This allows the seat to automatically adapt to different weights while also enabling the occupant to individually set the desired height position.
3Adaptability or versatility
If the switching element's neutral position is made adjustable, then individual height adjustment is improved, but device complexity increases
Solution Approach 1:
The guide element is mechanically integrated with both the switching element and the transmission element, combining multiple control functions into a single component. This merging approach allows the neutral position adjustment to be achieved without adding separate complex control mechanisms, thereby improving individual height adjustment while limiting the increase in device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables individual setting of seat height within the optimal vibration range, ensuring comfort and stability by allowing the seat height to be adjusted manually and remaining in the set position regardless of the driver's weight, while effectively damping vibrations.
Implementation Method 1
at least one air spring (7) having a variable air volume
Implementation Method 2
pneumatic vertical suspension
Implementation Method 3
vibrational movements of the scissor-action frame can be transmitted to a device for setting the air volume
Data Source
AI summary
The invention relates to a vehicle cab or a vehicle seat comprising an upper part and a lower part which are vertically spring-mounted relative to one another by means of at least one height-adjustable scissor-action frame comprising two scissor arms which are pivotable about a common axis, and at least one air spring having a variable air volume, it being possible for movements of the scissor-action frame to be transmitted to a switching element, by means of a transmission element that is mechanically operatively connected to the scissor-action frame, in order to control the air volume of the air spring, wherein a height-adjustment device for the scissor-action frame, comprising a manually actuable control lever element and a guide element that is mechanically operatively connected thereto, the switching element being able to be pivoted about a first axis of rotation and the transmission element being able to be pivoted about the first axis of rotation in the opposite direction to the switching element by means of the guide element, in order to change a neutral position of the switching element that is between two switches provided for controlling an air volume of the air spring.